X-ray absorption spectroscopy on layered cobaltates Na_xCoO_2

Details X-ray absorption spectroscopy on layered cobaltates Na_xCoO_2 X-ray absorption spectroscopy on layered cobaltates Na_xCoO_2

2006-06-20

arxiv.org/abs/cond-mat/0606518v1

PHYSICAL REVIEW B 74, 115123 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 8 figures

Scientific paper

10.1103/PhysRevB.74.115123

Measurements of polarization and temperature dependent soft x-ray absorption have been performed on Na_xCoO_2 single crystals with x=0.4 and x=0.6. They show a deviation of the local trigonal symmetry of the CoO_6 octahedra, which is temperature independent in a temperature range between 25 K and 372 K. This deviation was found to be different for Co^{3+} and Co^{4+} sites. With the help of a cluster calculation we are able to interpret the Co L_{23}-edge absorption spectrum and find a doping dependent energy splitting between the t_{2g} and the e_g levels (10Dq) in Na_xCoO_2.

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